Pseudo-contact angle due to superfluid vortices in ⁴He
classification
❄️ cond-mat.mtrl-sci
keywords
anglescontactevaporatedsuperfluidvaryingaccordinganglecalculations
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We have investigated spreading of superfluid $^{4}$He on top of polished MgF$_2$ and evaporated SiO$_{2}$ substrates. Our results show strongly varying contact angles of 0 - 15 mrad on the evaporated layers. According to our theoretical calculations, these contact angles can be explained by a spatially varying distribution of vortex lines, the unpinning velocity of which is inversely proportional to the liquid depth.
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